E+H Ultrasonic Level Transmitter FMU4X Error Code List
The E+H ultrasonic level transmitter FMU4X series is widely used in industrial level measurement, and its self-diagnostic function indicates fault types through error codes. This article compiles common error codes, descriptions, and solutions for reference by engineering and technical personnel and procurement staff.
Error Code Classification and Solutions
Error codes are divided into two categories: Alarm (A) and Warning (W). Alarms usually require immediate action, while warnings indicate potential problems. The following are listed in code order.
A101, A102, A110, A152, A160
- Error Description: Diagnostic error
- Solution: Reset; if the alarm persists, replace the circuit board.
W103
- Error Description: During initialization
- Solution: If the alarm message does not disappear within a few seconds, replace the circuit board.
A106
- Error Description: During download
- Solution: Wait for the download to finish and the message will disappear.
A111, A113, A114, A115, A121, A125, A155, A164, A171
- Error Description: Circuit board fault
- Solution: Reset; monitor the system's electromagnetic compatibility (EMC), improve if necessary; if the alarm persists after reset, replace the circuit board.
A116
- Error Description: Download error
- Solution: Check the connection and download again.
W153
- Error Description: During initialization
- Solution: Wait a few seconds; if the error persists, power off and then power on again.
A231
- Error Description: Sensor fault
- Solution: Check the connection; if necessary, replace the HF module or circuit board.
A281
- Error Description: Temperature probe open circuit
- Solution: Replace the sensor.
A502
- Error Description: Sensor model not detected
- Solution: Replace the sensor and/or circuit board.
W511
- Error Description: No factory calibration
- Solution: Perform factory calibration.
A512
- Error Description: During curve recording
- Solution: The alarm disappears after a few seconds.
A521
- Error Description: New sensor model detected
- Solution: Reset.
W601
- Error Description: Linearization curve not monotonic
- Solution: Correct the data table (enter a monotonically increasing data table).
W611
- Error Description: Fewer than two linearization points
- Solution: Enter more data pairs.
W621
- Error Description: Simulation function on
- Solution: Turn off the simulation function. Go to the "Output" (06) function group, "Simulation" (065) function.
E641
- Error Description: No usable echo
- Solution: Check basic calibration (see page 21).
E651
- Error Description: Level within safety distance, risk of overflow
- Solution: The error disappears when the level leaves the safety distance; a reset may be required. Lock the "Safety Settings" (01) function group, "Confirm Alarm" (017) function.
A661
- Error Description: Sensor temperature too high
- Solution: Check the medium temperature or inspect the sensor.
A671
- Error Description: Linearization incomplete
- Solution: Activate the linearization table.
W681
- Error Description: Current out of range
- Solution: Perform basic calibration and check linearization.
W691
- Error Description: Noise detected, level ramp activated
- Solution: Check the process conditions and eliminate noise interference.
Quick Reference Table of Common Error Codes
| Code | Type | Description | Solution |
|---|---|---|---|
| A101 | Alarm | Diagnostic error | Reset; if persists, replace circuit board |
| A102 | Alarm | Diagnostic error | Reset; if persists, replace circuit board |
| A110 | Alarm | Diagnostic error | Reset; if persists, replace circuit board |
| A152 | Alarm | Diagnostic error | Reset; if persists, replace circuit board |
| A160 | Alarm | Diagnostic error | Reset; if persists, replace circuit board |
| W103 | Warning | During initialization | If not disappearing within a few seconds, replace circuit board |
| A106 | Alarm | During download | Wait for download to finish |
| A111 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A113 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A114 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A115 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A121 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A125 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A155 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A164 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A171 | Alarm | Circuit board fault | Reset, check EMC, replace circuit board if necessary |
| A116 | Alarm | Download error | Check connection, download again |
| W153 | Warning | During initialization | Wait a few seconds, power off and restart |
| A231 | Alarm | Sensor fault | Check connection, replace HF module or circuit board |
| A281 | Alarm | Temperature probe open circuit | Replace sensor |
| A502 | Alarm | Sensor model not detected | Replace sensor and/or circuit board |
| W511 | Warning | No factory calibration | Perform factory calibration |
| A512 | Alarm | During curve recording | Disappears after a few seconds |
| A521 | Alarm | New sensor model detected | Reset |
| W601 | Warning | Linearization curve not monotonic | Correct data table |
| W611 | Warning | Fewer than two linearization points | Enter more data pairs |
| W621 | Warning | Simulation function on | Turn off simulation function |
| E641 | Error | No usable echo | Check basic calibration |
| E651 | Error | Level within safety distance, risk of overflow | Level leaves safety distance, may need reset |
| A661 | Alarm | Sensor temperature too high | Check medium temperature or inspect sensor |
| A671 | Alarm | Linearization incomplete | Activate linearization table |
| W681 | Warning | Current out of range | Perform basic calibration, check linearization |
| W691 | Warning | Noise detected | Check process conditions, eliminate noise interference |
Maintenance Recommendations
- Regularly check the connection between the sensor and circuit board to ensure good contact.
- When an alarm occurs, first try resetting; if it cannot be eliminated, then consider replacing components.
- Pay attention to electromagnetic compatibility (EMC) to avoid false alarms caused by interference.
- For warning codes, address them promptly to prevent them from escalating into alarms.
The above code table can help quickly locate faults in the E+H ultrasonic level transmitter FMU4X and improve maintenance efficiency. For more detailed guidance, please refer to the product manual.